db.getCollection("classes").insert( {
    _id: ObjectId("61bb063d305b000013005974"),
    name: "web01",
    tid: ObjectId("61bb0658305b000013005975")
} );
db.getCollection("classes").insert( {
    _id: ObjectId("61bc45c1305b000013005978"),
    name: "web02",
    tid: ObjectId("61bc481e305b000013005979")
} );
